826/German Diesel Question

Recently picked up a nice 826 with the German Diesel. Haven't gotten manuals yet, so I thought I'd ask here.

Problem is that the tach doesn't work. I started there- took the cable off the back of the tach, it's not turning(with engine running of course). So I took the other
end of the cable off of the 90-deg drive adapter on the front of the engine- the cable seems fine. Took the 90-deg adaptor off, and turning it by hand it seems to
function like it's supposed to- when I turn the input, the output(cable side) moves.

The input of the adapter is a flat shaft. I took a mirror and looked in the hole the adapter screws into with the engine running and the slotted piece in there that
drives the adapter is turning. But I put the adapter back on the engine, started it, and the output end of the adapter isn't turning.

Since I don't yet have a manual, and can't find a parts diagram online, here's my question- the 90-deg adapter has a jam nut on it so that it can be locked into the
proper angle for the tach cable. On this tractor, between the adapter and the front cover of the engine where it screws in, there's a brass "bushing", with male and
female threads, about 3/4 inch long, between the adapter and the front cover of the engine, that spaces the adapter out. Is this bushing supposed to be there? Or is it
something someone added, maybe to keep the hours from adding up?

Or is there something else that "usually" goes wrong that causes the tach not to work? Thanks!
 
The engine is listed separately from the tractor. You want to go to partstore.caseih.com and look up "358".

http://partstore.caseih.com/us/LambWebsterNorthJava/parts-search.html#epc::mr58908ar1042187
 
I had looked on that website but wasn't able to find that....The illustration in the link you sent looks a little different than what I have- part number 16, which they say is a reducer, has the same size threads on both sides on mine, and instead of being a hex shape, is round with two wrench flats on it. I'll do a little more digging on there and see if I can find out what's under that cover that drives the tach output. Thanks again!
 
Hi Ron, the problem is in the 90 degree adapter. There is a fiber washer as a spacer on the end of the shaft that drives the tach cable, The problem is the fiber washer wares and allows the shaft on the tach drive to push end wise and the gear on the tach drive shaft no longer mates with the gear on the shaft being driven by the timing gear. I have fixed a couple by carefully removing that end cap on the 90 degree drive and replacing the fiber washer with a metal washer and some grease and then sealing the end cap again.

JimB
 

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